\(\dfrac{-3}{17}\) + (\(\dfrac{2}{3}\) + \(\dfrac{3}{17}\))          

\(\dfrac{-24}{17}\) - (\(\dfrac{-7}{17}\) - \(\dfrac{1}{16}\))          

\(\dfrac{14}{13}\) + (\(\dfrac{-1}{13}\) - \(\dfrac{19}{20}\))        

\(\dfrac{1}{2}\) + \(\dfrac{4}{5}\)

\(\dfrac{1}{5}\) - \(\dfrac{-3}{4}\)

\(\dfrac{2}{7}\) - \(\dfrac{1}{3}\)

  tìm x dựa vào tính chất 2 phân số bằng nhau

\(\dfrac{x}{-3}\) = \(\dfrac{-5}{15}\)

2.x + 7 = 15